Combined tool and bushing for pneumatic hammers.



E. GREGORY.

COMBINED TOOL AND BUSHING FOR PNEUMATIC HAMMEHS.

APPLICATION FILED mus 15 I914.

1,160,597. Patented Nov. 16, 1915 UNITED STATES PATENT OFFICE.

EDWARD GREGORY, 0F GROVE CITY, PENNSYLVANIA.

COMBINED TOOL AND BUSHING FOR PNEUMATIC HAMMERS.

Specification of Letters Patent.

Patented Nov. 16, 1915.

Application filed June 15, 1914. Serial No. 845,136.

operate with a tool of similar formation to that of the bore of such bushings and this combination is especially adapted to be used in connection with pneumatic hammers or the like.

An object of this invention is the provision of a bushing so constructed as to strengthen the shank portion of the tool operating therein, thereby lengthening the life of the same.

With the above and other objects in view this invention resides in the novel features of construction, formations, combinations and arrangements of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawings in which Figure 1, is a longitudinal sectional view 7 of my bushing with tool applied, and with same removed from hammer cylinder, Fig. 2, is a rear elevation'of the bushing with tool in position, Fig. 3, is a front elevation of the bushing removed, Fig. 4, is a longitudinal sectional view of the same, and, Fig. 5, is a side elevation of the tool removed.

Referring to the accompanying drawings by similar characters of reference throughout, the numeral 10 designates my improved bushing in general, which is employed at the end of the hammer cylinder, not illustrated in the accompanying drawings, and secured thereto by the customary means, but as shown by Fig. 1, of the accompanying drawings, I have the bushing apphed to a chisel or similar tool A. This bushing 10 is of the ordinary construction having the customary body'p'ortion 11 with a flange 12 formed therefrom at its outer end, while the bore 13 in which operates the tool A is of a novel construction and it is in this bore and cooperating parts of the tool A, that I base my claim.

With reference to Fig. 4, of the accompanying drawings it will be manifest that I have provided a tapering cylindrical bore 14 within the said bushing 10 which extends over the outer end of the same inwardly to the intermediate portion of the body portion 11, at which point this bore terminates into a seat 15, which has extending therefrom a reduced octagonal bore 16 which extends therethrough the remaining length of the body portion 11 and which is for the recept1on of the octagonal shank B of the chisel or tool A. This chisel or tool A is formed with a corresponding shape to that of the entire bore 13 of the bushing 10 so that the same will readily operate therein and as clearly illustrated by Fig. 5 of the accompanying drawings, it will be readily seen that this chisel or tool A has the customary blade end C which terminates into a taper ng cylindrical body portion D correspondmg in shape to that of the tapering bore 14' of the bushing 10. This body portion D terminates into a shoulder E which seats itself into the seat 15 of the bore 14 when the tool is in operation, while extending from this shoulderE is the octagonal shank B which operates within the octagonal bore 16, of the said bushing, and it is upon the extreme end F of this shank B that the plunger of the pneumatic hammer or like delivers its repeated blows.

In View of the above it will be readily understood that I have provided a bushing and tool that will prove far superior in strength to that of such tools in use at the present time, as the tapering bore 14 of my bushing cooperating with the corresponding body portion D of the tool A when in use will have the greatest-tendency to strengthen the blade end C of the said tool thereby producing a means whereby the breaking of numerous such blades will be greatly reduced. I have also provided the octagonal bore 16 of the bushing for the purpose of reducing the wear and tear upon the shank portion of such tools, as it is a well known fact that cylindrical shank portions or the like produced upon such tools will eventually wear out of shape, their sides becoming somewhat flattened after a short period of constant use, but by providing a tool with my octagonal shank B to cooperate with a similar bore, a means is provided whereby the wear and tear is equally distributed on all sides of such shank portions, thus it will be readily understood that I have provided a means whereby the shank of such tools is greatly preserved and with-a bushing and tool constructed as herewith described and illustrated, it willbe manifest that the life of such tools will be greatly lengthened and that furthermore such a combination will prove far superior to those in use at the 5 present time.

It should be understood however that while this combination of tool and bushing are especially adapted for pneumatic tool use, the same combination may be used in 10 connection with various devices operating various tools in such bushing. It should further be understood in this connection that various minor changes in the details of construction may be resorted to within the 15 scope of the appended claim, without departing from orsacrificing any of the advantages of this invention.

From the foregoing disclosure 1t wlll be manifest that a bushing for pneumatic ham- 20 mers or the like of the character described 1s provided, which will cooperate with a suitable tool and thus fulfil all of the necessary requirements of such a device.

tool and said polygonal bore being open at the outer terminal thereof to permit the polygonal shank to receive the necessary re peated blows from the pneumatic plunger or the like.

In testimony whereof I afiix my signature in presence of two witnesses.

EDlVAR-D GREGORY.

Vitnesses M. O. ROBINS, B. L. COVERT. 

